120 lines
4.1 KiB
C++
120 lines
4.1 KiB
C++
/*
|
|
* Copyright (C) 2010, Google Inc. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
|
|
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef HRTFPanner_h
|
|
#define HRTFPanner_h
|
|
|
|
#include "FFTConvolver.h"
|
|
#include "DelayBuffer.h"
|
|
#include "mozilla/MemoryReporting.h"
|
|
|
|
namespace mozilla {
|
|
class AudioBlock;
|
|
} // namespace mozilla
|
|
|
|
namespace WebCore {
|
|
|
|
typedef nsTArray<float> AudioFloatArray;
|
|
|
|
class HRTFDatabaseLoader;
|
|
|
|
using mozilla::AudioBlock;
|
|
|
|
class HRTFPanner {
|
|
public:
|
|
HRTFPanner(float sampleRate,
|
|
already_AddRefed<HRTFDatabaseLoader> databaseLoader);
|
|
~HRTFPanner();
|
|
|
|
// chunk durations must be 128
|
|
void pan(double azimuth, double elevation, const AudioBlock* inputBus,
|
|
AudioBlock* outputBus);
|
|
void reset();
|
|
|
|
size_t fftSize() const { return m_convolverL1.fftSize(); }
|
|
|
|
float sampleRate() const { return m_sampleRate; }
|
|
|
|
int maxTailFrames() const;
|
|
|
|
size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
|
|
|
|
private:
|
|
// Given an azimuth angle in the range -180 -> +180, returns the corresponding
|
|
// azimuth index for the database, and azimuthBlend which is an interpolation
|
|
// value from 0 -> 1.
|
|
int calculateDesiredAzimuthIndexAndBlend(double azimuth,
|
|
double& azimuthBlend);
|
|
|
|
RefPtr<HRTFDatabaseLoader> m_databaseLoader;
|
|
|
|
float m_sampleRate;
|
|
|
|
// We maintain two sets of convolvers for smooth cross-faded interpolations
|
|
// when then azimuth and elevation are dynamically changing. When the azimuth
|
|
// and elevation are not changing, we simply process with one of the two sets.
|
|
// Initially we use CrossfadeSelection1 corresponding to m_convolverL1 and
|
|
// m_convolverR1. Whenever the azimuth or elevation changes, a crossfade is
|
|
// initiated to transition to the new position. So if we're currently
|
|
// processing with CrossfadeSelection1, then we transition to
|
|
// CrossfadeSelection2 (and vice versa). If we're in the middle of a
|
|
// transition, then we wait until it is complete before initiating a new
|
|
// transition.
|
|
|
|
// Selects either the convolver set (m_convolverL1, m_convolverR1) or
|
|
// (m_convolverL2, m_convolverR2).
|
|
enum CrossfadeSelection { CrossfadeSelection1, CrossfadeSelection2 };
|
|
|
|
CrossfadeSelection m_crossfadeSelection;
|
|
|
|
// azimuth/elevation for CrossfadeSelection1.
|
|
int m_azimuthIndex1;
|
|
double m_elevation1;
|
|
|
|
// azimuth/elevation for CrossfadeSelection2.
|
|
int m_azimuthIndex2;
|
|
double m_elevation2;
|
|
|
|
// A crossfade value 0 <= m_crossfadeX <= 1.
|
|
float m_crossfadeX;
|
|
|
|
// Per-sample-frame crossfade value increment.
|
|
float m_crossfadeIncr;
|
|
|
|
FFTConvolver m_convolverL1;
|
|
FFTConvolver m_convolverR1;
|
|
FFTConvolver m_convolverL2;
|
|
FFTConvolver m_convolverR2;
|
|
|
|
mozilla::DelayBuffer m_delayLine;
|
|
|
|
AudioFloatArray m_tempL1;
|
|
AudioFloatArray m_tempR1;
|
|
AudioFloatArray m_tempL2;
|
|
AudioFloatArray m_tempR2;
|
|
};
|
|
|
|
} // namespace WebCore
|
|
|
|
#endif // HRTFPanner_h
|